CN202634833U - Diming circuit for light-emitting diode (LED) lamp - Google Patents
Diming circuit for light-emitting diode (LED) lamp Download PDFInfo
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- CN202634833U CN202634833U CN 201220278339 CN201220278339U CN202634833U CN 202634833 U CN202634833 U CN 202634833U CN 201220278339 CN201220278339 CN 201220278339 CN 201220278339 U CN201220278339 U CN 201220278339U CN 202634833 U CN202634833 U CN 202634833U
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Abstract
The utility model provides a dimming circuit for a light-emitting diode (LED) lamp. The dimming circuit comprises a direct-current power supply circuit and a current control circuit, wherein the current control circuit is formed by connecting a potentiometer and at least one triode, the potentiometer is in serial connection on the direct-current power supply circuit, a power supply positive electrode is connected with a triode base electrode and an LED chip positive electrode, and a power supply negative electrode is connected with an LED chip negative electrode through an emission electrode and collection electrode of the triode. A second triode and a current limit resistor can be in serial connection between the potentiometer and the triode. The dimming circuit is simple in circuit structure, can wirelessly dim from 5 to 100 on the LED chip, has the buffer protection function in a current adjusting process, slows down aging of the LED chip, prolongs service life and is low in manufacture cost, stable in effect, safe and reliable, and suitable for dimming an LED lighting system.
Description
Technical field
The utility model relates to the light adjusting circuit of a kind of LED of control lamp brightness, particularly realizes the light adjusting circuit of step-less adjustment through regulating electric current.
Background technology
Present widely used LED light fixture is to adopt light-emitting diode as light emitting source; Produce cold illumination and the decorative lamp that causes light; Its less energy consumption, light efficiency be high, safeguard less, color is complete, safe; Being widely used in the long-time illumination of family, market, station terminal, hotel, hospital and other public place, is following light fixture Development Trend.
Lamp brightness is regulated the two kinds of methods that adopt usually, and the first is connected in series phase place on-delay circuit on power supply, perhaps on power circuit, carry out voltage distribution; The input power of light fixture is changed; This control method can only be useful in the light emitting source of thermic light, such as incandescent lamp, Halogen lamp LED, for the cold light light emitting source that causes; Like LED lamp, electricity-saving lamp, fluorescent lamp, can not produce regulating action.Second method is to use the multi-group light-emitting body as light source, and in conjunction with many group switches, through changing the variation that quantity makes whole light fixture produce light and shade of lighting of light source, this control method is extremely uneconomical, increased equipment input and maintenance cost.
The brightness regulation of existing LED light fixture all is to carry out light modulation according to the variation of LED drive current input, mainly is divided into simulation light modulation and PWM light modulation at present.The Circuits System of these two kinds of dimming modes is complicated, and required electronic device is too many, and the manufacturing cost height is faced upward, and dimming effect do not have special advantage, therefore, in general illuminator, can not be suitable for popularization widely.
Summary of the invention
Be reduction LED light fixture light modulating device cost cost, and realize stable performance, reliable purpose, the utility model proposes a kind of LED lamp light adjusting circuit.
For realizing above-mentioned purpose; The technical scheme of the utility model is; A kind of light adjusting circuit of LED lamp comprises DC power-supply circuit and current control circuit, and described current control circuit is the composite LED drive circuit that is connected and composed by potentiometer and triode; The positive pole of DC power-supply circuit connects first pin and the transistor base of potentiometer, and it is anodal to connect led chip; The negative pole of DC power-supply circuit connects second pin and the moving contact pin of potentiometer, and connects the emitter of triode; The collector electrode of triode connects the led chip negative pole.
The DC power-supply circuit of this programme is according to what of led chip load; Suitable direct voltage is provided; The positive pole of DC power supply is connected to base stage, collector electrode and the led chip of triode, and negative pole connects first pin and the moving contact pin of potentiometer, and connects the emitter of triode.Described potentiometer first pin of this patent, the pin at two ends when second pin is meant the potentiometer impedance.Evenly change the resistance value of potentiometer, the base current of triode changes, and the collector current through led chip also is linear variation thereupon, realizes the continuous adjusting to the led chip luminosity.The light adjusting circuit of this structure; Only need the cooperation of a common current rectifying and wave filtering circuit, convert the 220V AC power of civil power into DC power supply that voltage is fit to, just can realize stepless dimming led chip; Simple in structure, be fit to light modulation to the common LED lighting.
Be more preferably, the composite LED drive circuit in the such scheme also comprises second triode and current-limiting resistance, is serially connected between potentiometer and the triode, and first pin of potentiometer is connected with the base stage of second triode, and is connected to the positive pole of DC power-supply circuit; The collector electrode of second triode is connected to the DC power-supply circuit positive pole; The emitter of second triode connects current-limiting resistance, and the current-limiting resistance other end connects the base stage of triode.
Above-mentioned LED lamp light adjusting circuit, with the direct current that DC power-supply circuit provides, through the amplification of two triodes, the change in current scope further enlarges.Therefore,, make electric current through led chip, realize 5-100 stepless dimming led chip from can from 5% to 100% scope internalization through the adjusting of potentiometer.The current-limiting resistance of the suitable resistance of serial connection in the middle of two triodes; In the process of carrying out linear change electric current; The voltage that can keep being carried in led chip is more stable, prevents because changing on a large scale suddenly of electric current causes the circuit elements device; The particularly impact of led chip, the life-span of prolongation led chip.
The LED lamp light adjusting circuit of above-mentioned the utility model, described potentiometer preferably adopts potentiometer with switch.
Select potentiometer with switch for use, let the switch potentiometer directly control the break-make of DC power-supply circuit, realize the opening and closing of led chip power supply are not needed in circuit, to be provided with in addition switch, simplify circuit structure, more simple and practical.
The utility model uses Alternating Current Power Supply through reasonable disposition power module and circuit structure, can realize the stepless dimming of LED lamp, and simple in structure, easy to use, production cost is low, is suitable for applying in illuminator.
Description of drawings
Fig. 1 is the circuit block diagram of the utility model.
Fig. 2 is the circuit diagram of first kind of embodiment of the utility model.
Fig. 3 is the circuit diagram of second kind of embodiment of the utility model.
Embodiment
The preferred implementation of the utility model is described with reference to the accompanying drawings.
Referring to accompanying drawing 2, a kind of light adjusting circuit that is applied to the LED lamp connects current control circuit 2 by DC power-supply circuit 1, to led chip 3 power supplies.DC power-supply circuit adopts current rectifying and wave filtering circuit, and input is connected with the 220V electric main, and alternating current converts DC power supply through integrated circuit rectification, capacitor C 2 after considering ripple by capacitor C1, resistance R 1 step-down.
During use; The direct voltage that DC power-supply circuit 1 is provided is through the current limliting step-down of resistance R 2; Directly be loaded into the collector electrode of second triode, be added to the second triode N2 base stage b ' through resistance R 3 simultaneously, through the moving contact pin of regulator potentiometer W; Base current through the second triode N2 base stage b ' is changed, causes through emitter e ' emission current also change thereupon; Simultaneously, through the change in current of current-limiting resistance R, pass through the amplification of triode N again after, the electric current that is loaded on the led chip is produced changes, the luminosity of led chip will change.
The light adjusting circuit of the LED lamp of present embodiment utilizes potentiometer to change the resistance in the circuit, and through the amplification of two triodes, its Current Regulation scope reaches 5% to 100% variation, can realize the 5-100 stepless dimming to led chip.Simultaneously, behind the current-limiting resistance R of the suitable resistance of serial connection, carry out linearity and change in the process of electric current, the suitable of voltage that can keep being carried in led chip stablized, and reduces owing to the impact of electric current flip-flop to led chip.Compare with the LED light adjusting circuit of present other structure, circuit structure is more simplified, and it is stable, safe and reliable still can to reach dimming effect.
The above, only be with reference to description of drawings the preferred forms of the utility model, and be not used in qualification the utility model.Allly belong to various modifications in the category that the utility model claim explained, be equal to replacement and technological improvement, all belong within the protection range of the utility model certainly.
Claims (3)
1. LED lamp light adjusting circuit; Comprise DC power-supply circuit and current control circuit; It is characterized in that; Described current control circuit is the composite LED drive circuit that is connected and composed by potentiometer and triode, and the positive pole of DC power-supply circuit connects first pin and the transistor base of potentiometer, and it is anodal to connect led chip; The negative pole of DC power-supply circuit connects second pin and the moving contact pin of potentiometer, and connects the emitter of triode; The collector electrode of triode connects the led chip negative pole.
2. LED lamp light adjusting circuit according to claim 1; It is characterized in that; Described composite LED drive circuit also comprises second triode and current-limiting resistance; Be serially connected between potentiometer and the triode, first pin of potentiometer is connected with the base stage of second triode, and is connected to the positive pole of DC power-supply circuit; The collector electrode of second triode is connected to the DC power-supply circuit positive pole; The emitter of second triode connects current-limiting resistance, and the current-limiting resistance other end connects the base stage of triode.
3. according to one of claim 1 or 2 described LED lamp light adjusting circuit, it is characterized in that described potentiometer is a potentiometer with switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220278339 CN202634833U (en) | 2012-06-12 | 2012-06-12 | Diming circuit for light-emitting diode (LED) lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220278339 CN202634833U (en) | 2012-06-12 | 2012-06-12 | Diming circuit for light-emitting diode (LED) lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202634833U true CN202634833U (en) | 2012-12-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220278339 Expired - Lifetime CN202634833U (en) | 2012-06-12 | 2012-06-12 | Diming circuit for light-emitting diode (LED) lamp |
Country Status (1)
| Country | Link |
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| CN (1) | CN202634833U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108235502A (en) * | 2017-01-19 | 2018-06-29 | 肖志军 | The constant current driving method and circuit of LED light light modulation |
| CN109673091A (en) * | 2018-12-05 | 2019-04-23 | 兰州飞行控制有限责任公司 | A kind of flight control system console indicator light current regulating circuit |
| CN112599092A (en) * | 2020-12-31 | 2021-04-02 | 上海天马有机发光显示技术有限公司 | Organic light emitting display panel, driving method thereof and organic light emitting display device |
-
2012
- 2012-06-12 CN CN 201220278339 patent/CN202634833U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108235502A (en) * | 2017-01-19 | 2018-06-29 | 肖志军 | The constant current driving method and circuit of LED light light modulation |
| CN109673091A (en) * | 2018-12-05 | 2019-04-23 | 兰州飞行控制有限责任公司 | A kind of flight control system console indicator light current regulating circuit |
| CN112599092A (en) * | 2020-12-31 | 2021-04-02 | 上海天马有机发光显示技术有限公司 | Organic light emitting display panel, driving method thereof and organic light emitting display device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121226 |
|
| CX01 | Expiry of patent term |